And here we have the final state of each of the two experimental conditions after an hour or so, water + detergent above, milk + detergent below. I was quite surprised that in the end the food coloring diffused so little through the water. The chemical motor of the milk / detergent reaction, however, proved to be remarkably effective at mixing: you can even see a point surrounded by circles in the upper middle where an upwelling of milk driven from below was circulating, driving the continued mixing of the fluid.
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